An intercomparison of the spatial-temporal characteristics of SMOS and AMSR-E soil moisture products over Mongolia plateau

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) Pub Date : 2015-07-26 DOI:10.1109/IGARSS.2015.7325855

X. Wen, Hui Lu, Chengwei Li

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引用次数: 3

Abstract

In this study, we inter-compared the spatial-temporal characteristics of SMOS and AMSR-E soil moisture products over Mongolia plateau. The results show that in temporal scale, the standard deviation of SMOS soil moisture data is higher than JAXA and ECMWF products, comparable to the in situ observation. To demonstrate the spatial variation of SMOS and JAXA soil moisture products, we first defined the smoothness index (SSI). The mean and maximum value of SSI of SMOS are much higher than those of JAXA and ECMWF for both daily and monthly soil moisture products. The mean value of SSI of daily SMOS products is 1.284, while that of JAXA and ECMWF is 0.010 and 5.010@10-4, respectively. For monthly products, the mean value of SSI of SMOS is 0.264, while the value of JAXA is 0.004, and 3.753*10-4 for ECMWF. Further, we counted the SSI of SMOS and JAXA TB, and the SSI mean value of SMOS TB is higher than that of JAXA TB for both daily and monthly time scale. It indicates that the big uncertainty of SMOS soil moisture products may raises from the unstable TB observation, which is highly contaminated by RFI and even cannot be removed at monthly scale.

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蒙古高原SMOS和AMSR-E土壤水分产品时空特征对比

本研究对蒙古高原SMOS和AMSR-E土壤水分产品的时空特征进行了对比。结果表明:在时间尺度上，SMOS土壤湿度数据的标准偏差高于JAXA和ECMWF产品，与现场观测结果相当;为了展示SMOS和JAXA土壤水分产品的空间变化，我们首先定义了平滑指数(SSI)。SMOS的日、月土壤水分产品SSI均值和最大值均远高于JAXA和ECMWF。SMOS日产品的SSI平均值为1.284,JAXA和ECMWF的SSI平均值分别为0.010和5.010@10-4。月度产品SMOS的SSI平均值为0.264,JAXA的SSI平均值为0.004,ECMWF的SSI平均值为3.753*10-4。此外，我们对SMOS和JAXA TB的SSI进行了统计，SMOS TB的SSI平均值在日和月时间尺度上都高于JAXA TB。这表明SMOS土壤水分产品的不确定性很大，可能是由于TB观测不稳定，受RFI污染严重，甚至无法在月尺度上消除。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

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